Here are a few good sites for kids with a variety of games and activities!
Learning to Read http://www.starfall.com
FunBrain activities http://www.funbrain.com
Math & Language Arts activities http://www.internet4classrooms.com/skills_1st.htm
National Geographic for Kids http://www.nationalgeographic.com/kids/
Fun activities with Bill Nye the Science Guy http://www.billnye.com
Information and games about various animal groups. http://www.kidscom.com/games/animal/animal.html
Cool Science Stuff http://www.hhmi.org/coolscience/
Extreme Science http://www.extremescience.com/index.html
More science activities http://www.funology.com/
Puzzles and games http://puzzlemaker.school.discovery.com/
Online science word searches http://wilstar.com/Java/wordsearch/scipuz.htm
White House for Kids http://www.whitehouse.gov/kids/whlife/index.html